Map array of objects to Dictionary in Swift

Question

I have an array of Person\'s objects:

class Person {
   let name:String
   let position:Int
}

and the array is:

Answer 1

extension Array {
    func mapToDict(by block: (Element) -> T ) -> [T: Element] where T: Hashable {
        var map = [T: Element]()
        self.forEach{ map[block($0)] = $0 }
        return map
    }
}